• O&P

  • OCP

  • Oestrogen

  • Oestrogen and Progesterone receptor status

  • Oestrogen receptors

  • Oral Glucose Tolerance Test (OGTT or GTT)

  • Oral Lactose Tolerance

  • Osmolality (Osmolarity)

  • Osmolality (plasma, urine, stool)

  • Ova; Cysts and Parasite Exam